#define _CRT_SECURE_NO_WARNINGS 1

//https://leetcode.cn/problems/replace-all-s-to-avoid-consecutive-repeating-characters/description/

class Solution {
public:
    string modifyString(string s) {
        int n = s.size();
        for (int i = 0; i < n; i++)
        {
            if (s[i] == '?')
            {
                for (char ch = 'a'; ch <= 'z'; ch++)
                {
                    if ((i == 0 || ch != s[i - 1]) && (i == n - 1 || ch != s[i + 1]))
                    {
                        s[i] = ch;
                        break;
                    }
                }
            }
        }
        return s;
    }
};